Don't embed non-PDFs from the media library

git-svn-id: http://plugins.svn.wordpress.org/vanilla-pdf-embed/trunk@816588 b8457f37-d9ea-0310-8a92-e5e31aec5664
Fix spacing issue for PDFs with no title

Also, don't append PDF open parameters for the bare fallback link.

git-svn-id: http://plugins.svn.wordpress.org/vanilla-pdf-embed/trunk@818310 b8457f37-d9ea-0310-8a92-e5e31aec5664
Embed PDFs on attachment pages

git-svn-id: http://plugins.svn.wordpress.org/vanilla-pdf-embed/trunk@818312 b8457f37-d9ea-0310-8a92-e5e31aec5664